Kering SA warned that gross sales at Gucci will plunge about 20% within the first quarter on account of a steeper-than-expected decline within the Asia-Pacific area, widening the hole between the French luxurious firm and its foremost rivals.Kering’s American depositary receipts fell 10% after the corporate printed the discharge late Tuesday. The shares have dropped 22% over the previous 12 months as Kering tried to revitalize Gucci, the Italian label that accounts for about two-thirds of revenue, with out success.